70/30 Polyester Epoxy Resin with Friction Gun Spraying for Hybrid Powder Coatings
◎Introduction
HH2781T is tribo chargerable version of HH2781, it is a carboxyl polyester resin designed for 70/30 hybrid powder coatings.
Models with a T indicate powder coatings made with this polyester resin that can be sprayed with a friction gun.
At present, the common powder coating spraying processes include electrostatic spraying and friction gun spraying. Electrostatic spraying is widely used in China because of its low requirements for powder coatings. However, due to the generation of a corona field and the Faraday effect of electrostatic spraying, there will be dead corners on complex workpieces, and some corners are difficult to powder. Although the electrostatic gun has been improved many times, the Faraday effect can only be reduced, but cannot be avoided.
The friction gun spraying can well solve the problem of powder coating in the dead corners of complex workpieces. The friction gun spraying process has the following advantages:
1. The first powder coating rate is high, the efficiency is improved, and the recycled powder is reduced.
2. It could overcome the Faraday effect, especially effective for spraying complex workpieces.
3. Compared with the high-voltage electrostatic gun, the powder on the workpiece is more uniform, and the surface leveling and smoothness of the coating film are better.
4. Comprehensive automatic spraying can be used, so the labor costs are reduced.
◎Basic Features
Good mechanical properties
Good leveling
Good reactivity
◎Recommend Formulation:
| HH2781T |
E14U |
Filler ＆ pigment |
Leveling Agent |
Benzoin |
Leveling additive 701 |
| 210 |
90 |
192 |
4 |
2 |
2.5 |
◎Specifications:
| Appearance |
white or light yellow transparent flakes |
| Color (50% DMF) |
Max: 3 |
| Acid Value (mgKOH/g) |
50～60 |
| Softening Point (℃) |
95～105 |
| Glass Transition Temp. (℃) |
≥55
|
| Melting Viscosity (200℃, cone/plate, mPa·s) |
4000～5500 |
| Reactivity at 180℃ (s, 30% Epoxy) |
100～200 |
| Curing Requirement |
180℃×10min |
| Packaging |
PE Bags, Net Weight 25kg ± 0.1kg / bag |
◎Specifications II:
| Extrusion Condition |
Two-screw Extruder |
| Zone I: 90～110℃ |
Zone II: 110～120℃ |
| Speed of Revolution |
500～1200rpm |
| Fineness of Powder |
＜100μm |
| Application Condition |
Electrostatic Spraying With |
40～70KV |
| Coating Film Thickness |
50～70μm |
| Degreased Cold-rolled Steel |
0.5mm |
| Film Properties |
Gel Time (180℃, sec) |
120~220 |
| Horizontal Flow (180℃, mm) |
23~26 |
| Gloss (60°) |
≥90% |
| Bending (φ1mm) |
Pass |
| Adhesive (1mm, grade) |
0 |
| Pencil Hardness |
≥1H
|
| Impact (50cm) |
Pass |
◎Remarks:
All the polyester resins could be customized to Non-tin (A), anti gas burners (G), tribo gun (T) and anti-blooming (F).
◎Company Profile:
Kinte Materials Science and Technology Co., Ltd. is subordinate to China Machinery Industry Corporation (a key state-owned enterprise directly managed by SASAC, ranking 284 among the world's top 500 in 2021). It is a national high-tech enterprise under China National Electric Apparatus Research Institute Co., Ltd. (Stock Code: 688128), a listed enterprise on the SSE STAR MARKET. Focusing on the R & D, production, and sales of environmentally friendly coatings (powder coatings, waterborne industrial coatings) and powder coating resins, the company is committed to improving the global market competitiveness of China's environmentally friendly coating industry. Now it has become the leader and promoter in China’s technological development of environmentally friendly coatings as well as polyester resins for powder coatings!
In 2017, the new production base with 80000 tons annual capacity was put into construction in Dongguan, Guangdong, and the annual production capacity reached 120000 tons by the end of 2020, opening the road to global diversified development.
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70/30 Polyester Epoxy Resin With Friction Gun Spraying For Hybrid Powder Coatings Images
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